The following commit has been merged in the next branch: commit d22e13c6c380261cf0b13d34e6412a1e393b5197 Author: Sven Eckelmann sven@narfation.org Date: Sat Dec 10 15:28:36 2011 +0100
batman-adv: Only write requested number of byte to user buffer
Don't write more than the requested number of bytes of an batman-adv icmp packet to the userspace buffer. Otherwise unrelated userspace memory might get overridden by the kernel.
Signed-off-by: Sven Eckelmann sven@narfation.org
diff --git a/icmp_socket.c b/icmp_socket.c index 3b04fff..d9c1e7b 100644 --- a/icmp_socket.c +++ b/icmp_socket.c @@ -136,10 +136,9 @@ static ssize_t bat_socket_read(struct file *file, char __user *buf,
spin_unlock_bh(&socket_client->lock);
- error = copy_to_user(buf, &socket_packet->icmp_packet, - socket_packet->icmp_len); + packet_len = min(count, socket_packet->icmp_len); + error = copy_to_user(buf, &socket_packet->icmp_packet, packet_len);
- packet_len = socket_packet->icmp_len; kfree(socket_packet);
if (error)